Muji has US stores. And their gel pens I think must be OEM by Zebra. The Zebra Sarasa has a different clip, but the parts are interchangeable, I took one of each apart and made two hybridd.
I may press too hard, but I've had a few packs of them and ~50% would break on me and start leaking ink like a squid. Great pens otherwise though.
Muji 0.38mm gel pens are my favourite cheap good pens (they're about $1.50 AUD in Australia).
I bought some 0.18s back in the early 00s. Most were too scratchy.
0.25 to 0.3 tends to be okay. Very handy for writing very small. The thinner traces save ink, too.